Lands



PIETER DE LANGE AND ROBERT AERNOUI BARON VAN LYNDEN.

THERMIC TELEPHONE AND ITS MANUFACTURE. APPLICATION man nov.4. I9I5.

I 1,321,989.n Patented Nov. 18, 1919.,

rrnrnn nu llvdl l'til-E MD ihlERNUlI'l BARON van lL'll'Ill'lElElil, 013 'UTRlEUl-llll, NETHER- lrllthlJDS, 'MSIH'NUFW, BY llllFlSNFi .dSS'lGhl'hdlEltl'Ffl, 'llt'i nnrnnrcan 'llll-llEllt-MUFHUNE CUM- l -MW, tilt" FUSWUN, MASSAUHUQFTTS, d. lifiltl tlldifhll'lllll l' tlF IlllhliEfihCl-llllilhlllllflil.

useless. if

application filed llloveinher it, .lllt'lltlterlal tile. lltttlh.

To all whom/it may concern:

Be it lrnown that we, Frnrnn on lhanen and liloeunr .lnnnour Banon van liirnnnn,

' both subjects of the Queen of the Netherlit lands, and residingat lUtrecht, inthe hlethen lands, have invented new and useful lime provements in 'lhermic 'llelephones and their Manufacture, of which the following is a specification.

'Ulur invention relates to the manufacture of supports for the'heating conductors of therinic telephones. AS is well lrnown, the manufacture of heating conductors for therrnic telephones offers difficulties when it is to he practised on a large scale. The object of our invention is to enahlethehuilding up of arc-shaped or looped cpnductors to be effected on a large scale in a simple and yet reliable manner,

7 According to this invention, the ends of the heating conductor wires which are bent forced i into grooves of asupport, so that the heating conductors areconnected to said support without special fixing means.

'lwo ways of supporting arc-shaped con ductors according to this invention are illu 'trated by way of example in the accompanying drawing in which Figures 1 and 2 are perspective views illustrating two forms of supports and wires embodying our present invention, and Figs. 3 and a are perspective views of two forms of wire loopssuitable for use in connection with our present invention.

in: the construction shown in Fig. l a heating conductor wire consisting of several arcs or loops 1 and of straight intermediate portions 2, is connected to its support 3 made of insulating material, by pressing the straight intermediate portions 2 into a groove l in the support 3'. 'lhearched heating conductors thus produced will naturally he in series connection.

tion away from the central: portion of the The support 3, which in this case'musthe made of insulatare, in other words, such pressure will bring the center of the arc nearer tothe support.

F ig. 2 shows a circular heating conductor support 5 provided with an'annular groove ti and a groove l extending along a diameter. The heating conductor wire which consists of several arcs 8 and straight or approximately straight intermediate portions 9, is secured to the support 5 in the manner shown in the drawing, by pressing the said intermediateportions 9 into the grooves ii and 'l. in this case also the heating condoctors constituted by the loops 8, are in serles connection.

The heating conductors connected to their" support in the manner described, c'anbe etched without didiculty to the desired sound-producer length, by dipping them to the proper depth in an etching bath with their central arc-shaped portions depending downward. at an angle, to the branches of the wlre, are,

.struction shown in Fig. her that shown in Fig. Q, is made up of indivldual wires such as represented in Figs. 3 and 4t, the adjacent ends of neighboring individualwires fl ll tilt lli

till

will he forced into a groove of the support in sucha manner that such ends'will-he in contact with each other, to properly conduct the current.

We claim:

l. The process of securing arc-shaped conductor wires of thermic telephones to their supports, which consists in bending the ends of said wires laterally and ressing said ends into grooves provided in t e support, while leaving'the' arc portions of the wires projecting free from said support. 7

v 2.. The process of securing arc-shaped con ductor wires of therrnic telephones' to their supports, which consists inhending the ends of said wires laterally and pressing said ends, in. a direction away from the'central llll portions of the arcs, into grooves provided in the support, wh1le leaving such arc po rtions of the Wires projecting free from sa1d support;

prising an insulating member havin more grooves, and a serles of Wm;

3. In a thermo-telephone, a heat unit comone or ops in 

